Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 43: Perovskite and Hybrid Photovolatics II (joint session HL/CPP)

HL 43.8: Vortrag

Donnerstag, 4. April 2019, 17:00–17:15, H36

Growth Monitoring and Evolution of Optoelectronic Proper- ties during the Formation of CH3NH3PbI3-xClx — •Klara Suchan¹, Justus Just¹, Eva L. Unger^1,2, José Marquez Prieto², and Thomas Unold² — ¹Lund University, Paradisgatan 2, 22350 Lund, Sweden. — ²Helmholtz-Zentrum Berlin, Hahn-Meitner-Platz 1, 14109 Berlin, Germany

We present a detailed investigation of the formation mechanism and the evolution of optoelectronic properties during annealing of chlorine derived methylammonium lead iodide (MAPIC). MAPIC layers are prepared by a one-step solution based process. While solution based processes do not need cost intensive vacuum technology and no high- temperature annealing steps, little is known about the exact mechanisms during synthesis. This prohibits identification and exact control of all relevant variables, leading to widely reported poor reproducibility. Using in-situ optical reflection we are able to monitor the evolution of the MAPIC phase as a function of time and processing temperature. The extracted formation kinetics are fitted using an altered Johnson-Mehl-Avrami-Kolmogorov model and show that the presence of Chlorine induces a delayed formation of MAPIC. This is verified by X-ray diffraction and X-ray fluorescence measurements. From absolute photoluminescence measurements we determine the quasi-Fermi level splitting during film formation. Correlating structural and electronic properties, we will present a detailed view on the reaction route during synthesis and specifically the influence of annealing conditions on the process and its intermediate states